极性半导体量子点中双极化子LO声子平均数的温度依赖性  

Temperature Dependence of the Mean Number of LO Phonons of the Bipolarons in Polar Semiconductor Quantum Dots

作　　者：乌云其木格[1] 韩超[2] 额尔敦朝鲁[2] 

机构地区：[1]内蒙古民族大学物理与电子信息学院,内蒙古通辽028043 [2]河北科技师范学院凝聚态物理研究所,河北秦皇岛066004

出　　处：《固体电子学研究与进展》2012年第4期314-317,共4页Research & Progress of SSE

基　　金：内蒙古自治区高等学校科学技术研究项目(NJ101116)

摘　　要：采用Huybrechts线性组合算符法和Lee-Low-Pines变分方法研究了极性半导体量子点中双极化子性质的温度依赖性,推导出了量子点中双极化子的LO声子平均数的表达式。数值计算结果表明,双极化子的LO声子平均数随两电子间相对距离的增大或温度的升高而减小,随电子-LO声子耦合强度的增加而增大;两电子间的相对距离、电子-LO声子耦合强度和温度是影响双极化子束缚态稳定性的重要因素。Temperature dependence of the bipolarons in polar semiconductor quantum dots （QDs） is studied by means of Huybrechts＇ linear-combination operator method and the Lee-Low- Pines variational method. The expressions for the mean number of LO phonons of the bipolaron in the QD were derived. Numerical results show that the mean number of LO phonons of the bipolaron decreases with increasing the relative distance between two electrons or the temperature, but increases with increasing the electron-LO phonon coupling strength; The relative distance between two electrons, the electron-LO phonon coupling strength and the temperature are the important factors influencing the stability of the bipolaron＇ s bound state.

关 键 词：量子点 体纵光学声子平均数 温度依赖性 

分 类 号：O471.4[理学—半导体物理]